750587 030 Oversize

This S&S Cycle reed valve crankcase breather is a modern solution for the common oil carry-over problems found in 1993 to 2000 Evolution Big Twin engines. It fits Dyna, FXR, Softail, and Touring models, replacing the standard rotary breather valve with a patent-pending reed design. By opening and closing based on pressure demand rather than mechanical timing, it compensates for air mass lag at high revs. This is particularly effective for engines pushed to higher performance levels where the window to evacuate air is shortest. The assembly fits directly into the breather gear cavity without the need for complex timing alignment, making it a quick and effective workshop upgrade for any Evo owner looking to improve crankcase scavenging.